Answer:
The probability is 0.503
Step-by-step explanation:
If the ghost appearances occur in the house according to a Poisson process with mean m, the time between appearances follows a exponential distribution with mean 1/m. so, the probability that the next ghost appearance happens before x hours is equal to:

Then, replacing m by 1.4 ghosts per hour we get:

Additionally, The exponential distribution have a memoryless property, so if it is now 1:00 p.m. and we want the probability that ghost appear before 1:30 p.m., we need to find the difference in hours from 1:00 p.m and 1:30 p.m. no matter that the last ghost appearance was at 12:35 p.m.
Therefore, there are 0.5 hours between 1:00 p.m. and 1:30 p.m, so the probability that the 7th ghost will appear before 1:30 p.m is calculated as:

After the contractor cut the 3.25 foot piece off the 12 foot piece of lumber, 8 3/4 feet of lumber was left. He than made 6 cuts to have 7 pieces of wood 1 1/4 feet long.
9) Area of Figure = Area of rectangle + area of triangle
A = 17 * 22 + (1/2 * 12 * 19)
A = 374 + 114
A = 488 cm²
10) Area of Figure = Area of rectangle + area of triangle
A = 8 * 4 + (1/2 * 3*4)
A = 32 + 6
A = 38 cm²
Hope this helps!
A = 3.14 d= 52
R=52/2 = 26”
A of circle= 3.14 r^2
A=3.14*26^2
A=676(3.14)
A=2,122.64”
So the answer is b
Answer:
Step-by-step explanation:
88/4=22
but she has 8 left over. So that means she has 21 students.